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Delft University of Technology
1.
Moesker, Niek (author).
Sandbar breakwaters: Analysis of the effects of variations in wave climate on the morphological development of sandbar breakwaters by using the Lekki Sandbar Breakwater case study.
Degree: 2020, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:2c29603c-9cf9-4f51-935b-881db5f52044 
► Many coastlines feature a sediment transport in a dominant direction, possibly burying a traditional breakwater in sand in several years. The sandbar breakwater concept uses…
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▼ Many coastlines feature a sediment transport in a dominant direction, possibly burying a traditional breakwater in sand in several years. The sandbar breakwater concept uses this sediment supply to its benefit to make the use of vast amounts of rocks abundant. During this research the morphological development of the worlds first sandbar breakwater built in Lekki, Nigeria, is analysed: The minimal amount of sand used for construction of the Lekki breakwater is placed such that the combination of the adaptation of the initial profile and the natural supply of sediment results in a smooth coastline at the end of the first year. This development is in turn used to setup a calibrated model to study the influence of the wave climate on the development of the sandbar breakwater concept. The wave climate at Lekki is characterised by a single dominant wave direction (called unidirectional) and has a narrow direction bandwidth (yearly standard deviation of the wave direction is about 5 degrees). This ideal wave climate is altered to research the influence of the mean wave direction, directional variation and the sequence of waves (seasonality). The study showed the sandbar breakwater concept to be mainly influenced by the mean wave direction and to lesser extent by the directional variation and the seasonality. These results can be used to make a first assessment on the possibility of applying a sandbar breakwater for a wave climate somewhere around the world.
Coastal Engineering
Advisors/Committee Members: Aarninkhof, Stefan (mentor), Labeur, Robert Jan (graduation committee), Antonini, Alessandro (graduation committee), de Wit, Lynyrd (graduation committee), Hendriks, Antoon J.H. (graduation committee), van der Spek, Bart-Jan (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: sandbar; breakwater; sand; Lekki; Nigeria; sand breakwater; sandbar breakwater; sandy breakwater; breakwater of sand
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APA (6th Edition):
Moesker, N. (. (2020). Sandbar breakwaters: Analysis of the effects of variations in wave climate on the morphological development of sandbar breakwaters by using the Lekki Sandbar Breakwater case study. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:2c29603c-9cf9-4f51-935b-881db5f52044
Chicago Manual of Style (16th Edition):
Moesker, Niek (author). “Sandbar breakwaters: Analysis of the effects of variations in wave climate on the morphological development of sandbar breakwaters by using the Lekki Sandbar Breakwater case study.” 2020. Masters Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:2c29603c-9cf9-4f51-935b-881db5f52044.
MLA Handbook (7th Edition):
Moesker, Niek (author). “Sandbar breakwaters: Analysis of the effects of variations in wave climate on the morphological development of sandbar breakwaters by using the Lekki Sandbar Breakwater case study.” 2020. Web. 02 Mar 2021.
Vancouver:
Moesker N(. Sandbar breakwaters: Analysis of the effects of variations in wave climate on the morphological development of sandbar breakwaters by using the Lekki Sandbar Breakwater case study. [Internet] [Masters thesis]. Delft University of Technology; 2020. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:2c29603c-9cf9-4f51-935b-881db5f52044.
Council of Science Editors:
Moesker N(. Sandbar breakwaters: Analysis of the effects of variations in wave climate on the morphological development of sandbar breakwaters by using the Lekki Sandbar Breakwater case study. [Masters Thesis]. Delft University of Technology; 2020. Available from: http://resolver.tudelft.nl/uuid:2c29603c-9cf9-4f51-935b-881db5f52044
Delft University of Technology
2.
Aggarwal, A. (author); Vargas Solis, A. (author); Pasaoglu, M. (author); Harihar, S. (author); Wahida, S. (author).
Breakwater Design for protection of floating houses in Haringvliet Region.
Degree: Department Hydraulic Engineering, 2014, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:9834edd5-3ce7-40c0-8571-73163e9024fd
► A floating house development project to be constructed in the coast of Hellevoetsluis, in the municipality of Voorne-Putten, is under consideration. Within a project of…
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▼ A floating house development project to be constructed in the coast of Hellevoetsluis, in the municipality of Voorne-Putten, is under consideration. Within a project of this nature, several aspects need to be taken into account in order to safeguard the infrastructure against additional loadings to which regular houses are not exposed to. Hydrodynamic forcing could directly or indirectly cause damage and unpleasant displacements on the houses, as they float on the waters of the Harringvliet estuary. The above can be undermined by protecting the area against waves, the most relevant loading for this site, by means of a wave wall or breakwater. By doing so, waves impacting directly on the houses are avoided; additionally calm waters behind the structure guarantee adequate condition for living facilities.
Hydraulic Engineering
Civil Engineering and Geosciences
Subjects/Keywords: breakwater; floating houses
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APA (6th Edition):
Aggarwal, A. (author); Vargas Solis, A. (author); Pasaoglu, M. (author); Harihar, S. (author); Wahida, S. (. (2014). Breakwater Design for protection of floating houses in Haringvliet Region. (Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:9834edd5-3ce7-40c0-8571-73163e9024fd
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Aggarwal, A. (author); Vargas Solis, A. (author); Pasaoglu, M. (author); Harihar, S. (author); Wahida, S (author). “Breakwater Design for protection of floating houses in Haringvliet Region.” 2014. Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:9834edd5-3ce7-40c0-8571-73163e9024fd.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Aggarwal, A. (author); Vargas Solis, A. (author); Pasaoglu, M. (author); Harihar, S. (author); Wahida, S (author). “Breakwater Design for protection of floating houses in Haringvliet Region.” 2014. Web. 02 Mar 2021.
Vancouver:
Aggarwal, A. (author); Vargas Solis, A. (author); Pasaoglu, M. (author); Harihar, S. (author); Wahida S(. Breakwater Design for protection of floating houses in Haringvliet Region. [Internet] [Thesis]. Delft University of Technology; 2014. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:9834edd5-3ce7-40c0-8571-73163e9024fd.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Aggarwal, A. (author); Vargas Solis, A. (author); Pasaoglu, M. (author); Harihar, S. (author); Wahida S(. Breakwater Design for protection of floating houses in Haringvliet Region. [Thesis]. Delft University of Technology; 2014. Available from: http://resolver.tudelft.nl/uuid:9834edd5-3ce7-40c0-8571-73163e9024fd
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Hawaii – Manoa
3.
Shimabuku, Nathan Takayuki.
Long wave run-up over submerged reef and breakwater.
Degree: 2016, University of Hawaii – Manoa
URL: http://hdl.handle.net/10125/101027
► M.S. University of Hawaii at Manoa 2012.
In this thesis study, joint numerical and experimental studies were carried out to examine the effects that a…
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▼ M.S. University of Hawaii at Manoa 2012.
In this thesis study, joint numerical and experimental studies were carried out to examine the effects that a submerged breakwater's length, distance from the beach and height have on the wave runup. The numerical program was based on a staggered grid leapfrog method on the shallow water equations which is used to simulate runup. Propagation over the reef is simulated with a predictor corrector Boussinesq scheme. We experimentally observed that a trend based on the wave's wavelength, length of the breakwater and lagoon spacing. We see that maximum and minimum runup reduction is observed at half integer and integer values of ζ and γ depending if the wave breaks. We define ζ and γ as the breakwater's lagoon spacing or the breakwater's length in terms of wavelength of the initial wave divided by the breakwater's height in terms of still water depth. We observed that the maximum runup reduction for a non breaking wave and minimum runup reduction for breaking waves were observed at half integer and integer values of γ. We also observed that if a breakwater is present the runup generated by waves can be reduced up to 40% but may be increased by 5%, with the exception of one measurement and that if wave breaking does occur the runup can be reduced by 80% and that it can be increased by 40%.
Subjects/Keywords: submerged reef; breakwater
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APA (6th Edition):
Shimabuku, N. T. (2016). Long wave run-up over submerged reef and breakwater. (Thesis). University of Hawaii – Manoa. Retrieved from http://hdl.handle.net/10125/101027
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Shimabuku, Nathan Takayuki. “Long wave run-up over submerged reef and breakwater.” 2016. Thesis, University of Hawaii – Manoa. Accessed March 02, 2021.
http://hdl.handle.net/10125/101027.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Shimabuku, Nathan Takayuki. “Long wave run-up over submerged reef and breakwater.” 2016. Web. 02 Mar 2021.
Vancouver:
Shimabuku NT. Long wave run-up over submerged reef and breakwater. [Internet] [Thesis]. University of Hawaii – Manoa; 2016. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/10125/101027.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Shimabuku NT. Long wave run-up over submerged reef and breakwater. [Thesis]. University of Hawaii – Manoa; 2016. Available from: http://hdl.handle.net/10125/101027
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
4.
Knoll, Alex Baxter.
Laboratory Measurements of Wave Forcing and Reactions on a Model Submerged Mesh Breakwater.
Degree: MS, Ocean Engineering, 2014, Texas A&M University
URL: http://hdl.handle.net/1969.1/153518
► The purpose of this thesis is to design the test setup, perform the model tests, and process the data to find the wave forces on…
(more)
▼ The purpose of this thesis is to design the test setup, perform the model tests, and process the data to find the wave forces on a submerged
breakwater. Breakwaters are coastal protection structures used to help prevent the erosion of the shoreline. Submerged breakwaters are a more recently developed type of offshore detached
breakwater that does not interfere with the ocean view and still helps prevent the longshore transport of sediment. For submerged breakwaters that are made of a single structure and placed on the seafloor, the forces must be estimated to ensure proper anchoring.
The prototype submerged
breakwater that was examined was a 40 ft long 14 ft diameter half cylinder. The model tested in the laboratory was a 4:1 scale, with a model diameter of 3.4 ft and a length of 10 ft. The estimated forcing on the structure came from measurements during model testing in the Haynes Coastal Engineering Laboratory wave tank. Both regular sinusoidal waves and irregular waves were generated. The significant wave heights ranged from 0.75 ft to 1.0 ft and wave periods varied from 2.0 sec to 3.0 sec using a JONSWAP wave spectrum with a peak enhancement factor of 3.3. Theoretical calculations were completed to help size the instrumentation needed to conduct the experiments. Theoretical calculations were based on the drag law to obtain the force, and Airy as well as Stokes 2nd Order wave theory to obtain the orbital velocities.
It was found that the maximum expected load for all cases at the anchor without any factor of safety (FOS) is 38 lb in shear and 9.9 lb of uplift force. This equates to prototype forces of 2,433 lb of shear and 633 lb of uplift force. Using a FOS of 2.0 the prototype horizontal reaction force required is 4,866 lb and the prototype uplift reaction is 1,266 lb. A total prototype reaction force of 5,028 lbs per anchor is needed. These anchors could be gravity anchors, driven piles or screw anchors.
Advisors/Committee Members: Randall, Robert (advisor), Chen, Hamn-Ching (committee member), Morrison, Gerald (committee member).
Subjects/Keywords: Submerged Breakwater; Wave Forcing
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APA (6th Edition):
Knoll, A. B. (2014). Laboratory Measurements of Wave Forcing and Reactions on a Model Submerged Mesh Breakwater. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/153518
Chicago Manual of Style (16th Edition):
Knoll, Alex Baxter. “Laboratory Measurements of Wave Forcing and Reactions on a Model Submerged Mesh Breakwater.” 2014. Masters Thesis, Texas A&M University. Accessed March 02, 2021.
http://hdl.handle.net/1969.1/153518.
MLA Handbook (7th Edition):
Knoll, Alex Baxter. “Laboratory Measurements of Wave Forcing and Reactions on a Model Submerged Mesh Breakwater.” 2014. Web. 02 Mar 2021.
Vancouver:
Knoll AB. Laboratory Measurements of Wave Forcing and Reactions on a Model Submerged Mesh Breakwater. [Internet] [Masters thesis]. Texas A&M University; 2014. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/1969.1/153518.
Council of Science Editors:
Knoll AB. Laboratory Measurements of Wave Forcing and Reactions on a Model Submerged Mesh Breakwater. [Masters Thesis]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/153518
Delft University of Technology
5.
Hellinga, L.B. (author).
Stability of Single Layer Cubes on Breakwater Rear Slopes.
Degree: 2016, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:1a0c5a19-4cbb-49c8-96bc-236d0a40d278
► Breakwaters with single layer concrete armour are very commonly applied nowadays. Much research is available on the stability of single layer armour units on the…
(more)
▼ Breakwaters with single layer concrete armour are very commonly applied nowadays. Much research is available on the stability of single layer armour units on the seaward slope. However, rear slopes design methods for single layer armour units are rare. On rear side slopes usually similar sized units as on the seaward slope are applied. Limited design methods are available for the stability of concrete armour units on the rear side of a
breakwater. To obtain stability information on single layer cubes on the rear side, scale model tests have been performed in the wave flume of the University of Technology Delft. The purpose of the model tests is to obtain a relation between the overtopping wave characteristics (overtopping volume of an individual wave event and the overtopping wave front velocity) and the stability of the cubes at the rear slope of low crested breakwaters. This relation can lead to a more optimal rear side
breakwater design. The test programme consists of different configurations, in which the following parameters have been varied: - Wave steepness: three typical values for steepness have been tested s_op=0.015, 0.027 and 0.039; - Relative crest width: relative crest width ranges were W_c/H_s= 1.1 6.3; - Relative free board: relative free board ranges were R_c/H_s= 0.4 1.3; - Rear slope angle: two slope angles of 1:2 and 1:1.5 have been tested; - Packing density; packing densities of 73% and 69% have been tested A total of 11
breakwater configurations have been tested. Each configuration was tested with a sequence of waves with increasing wave height until failure of the armour layer occurred. The focus was on the determination of start of damage of the rear armour cubes, but also on filter material wash out. Together with the stability tests, wave overtopping volume tests have been performed. The overtopping volume per wave was measured in a special designed box. The overtopping wave front velocity at the crest is measured by correlating the signals of two wave gauges. The number of displaced cubes in the rear slope armour layer has been determined with image analyses and expressed in the damage number N_od. The influences of the various parameters and overtopping characteristics on the rear slope damage are presented in stability graphs. Due to lack of sufficient data points, no trend line could be established. However, the graphs can be used as a guideline for conceptual
breakwater design. The critical overtopping characteristics are in a wide range. Therefore, the quantitative influence of the overtopping velocity and -volume on the rear slope damage is unclear. This suggest that other aspects may influence the stability of the rear slope, for example the transmission through the
breakwater or the shape of the overtopping flow around the rear slope. The analysis of the test data shows that damage on the single layer cubes on
breakwater rear sides occurs later than expected. The expected cube dimensions were calculated for various configurations. First, the armour dimension of randomly placed rock…
Advisors/Committee Members: Uijttewaal, W.S.J. (mentor), Verhagen, H.J. (mentor), Kuiper, C. (mentor), Van den Berg, B. (mentor), Van Gent, M.R.A. (mentor).
Subjects/Keywords: breakwater; rear slope; stability; overtopping
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APA (6th Edition):
Hellinga, L. B. (. (2016). Stability of Single Layer Cubes on Breakwater Rear Slopes. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:1a0c5a19-4cbb-49c8-96bc-236d0a40d278
Chicago Manual of Style (16th Edition):
Hellinga, L B (author). “Stability of Single Layer Cubes on Breakwater Rear Slopes.” 2016. Masters Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:1a0c5a19-4cbb-49c8-96bc-236d0a40d278.
MLA Handbook (7th Edition):
Hellinga, L B (author). “Stability of Single Layer Cubes on Breakwater Rear Slopes.” 2016. Web. 02 Mar 2021.
Vancouver:
Hellinga LB(. Stability of Single Layer Cubes on Breakwater Rear Slopes. [Internet] [Masters thesis]. Delft University of Technology; 2016. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:1a0c5a19-4cbb-49c8-96bc-236d0a40d278.
Council of Science Editors:
Hellinga LB(. Stability of Single Layer Cubes on Breakwater Rear Slopes. [Masters Thesis]. Delft University of Technology; 2016. Available from: http://resolver.tudelft.nl/uuid:1a0c5a19-4cbb-49c8-96bc-236d0a40d278
Delft University of Technology
6.
de Jong, R.J. (author).
Wave transmissions at low-crested structures. Stability of tetrapods at front, crest and rear of a low-crested breakwater.
Degree: Civil Engineering and Geosciences, Hydraulic Engineering, 1996, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:e091d54b-bffa-44ba-8d5d-850cdc03731a
► This report is the result of the Master thesis of the author, at Delft University of Technology, Faculty of Civil Engineering. The study was performed…
(more)
▼ This report is the result of the Master thesis of the author, at Delft University of Technology, Faculty of Civil Engineering. The study was performed at DELFT HYDRAULICS, in cooperation with Boskalis Westminster Dredging BV. Despite the many studies and experiments that have already been performed on the subject of low-crested breakwaters, one has still not yet been able to completely comprehend wave transmission and damage inflicted on breakwaters. The knowledge of the processes occurring at lowcrested breakwaters is still limited. Moreover only a small number of experiments is available. This two-part report is an attempt to contribute to the enhancement of the understanding of the wave transmission at low-crested structures and the stability of low-crested breakwaters with an armour layer of Tetrapods. Part A of this report deals with the derivation of new transmission formulae, Part B deals with stability of Tetrapods at the three segments, Front, Crest and Rear of a low-crested breakwater.
Civil Engineering and Geosciences
Advisors/Committee Members: d'Angremond, K. (mentor), Tutuarima, W.H. (mentor), van der Meer, J. (mentor), Visser, P.J. (mentor).
Subjects/Keywords: breakwater; tetrapod
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APA (6th Edition):
de Jong, R. J. (. (1996). Wave transmissions at low-crested structures. Stability of tetrapods at front, crest and rear of a low-crested breakwater. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:e091d54b-bffa-44ba-8d5d-850cdc03731a
Chicago Manual of Style (16th Edition):
de Jong, R J (author). “Wave transmissions at low-crested structures. Stability of tetrapods at front, crest and rear of a low-crested breakwater.” 1996. Masters Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:e091d54b-bffa-44ba-8d5d-850cdc03731a.
MLA Handbook (7th Edition):
de Jong, R J (author). “Wave transmissions at low-crested structures. Stability of tetrapods at front, crest and rear of a low-crested breakwater.” 1996. Web. 02 Mar 2021.
Vancouver:
de Jong RJ(. Wave transmissions at low-crested structures. Stability of tetrapods at front, crest and rear of a low-crested breakwater. [Internet] [Masters thesis]. Delft University of Technology; 1996. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:e091d54b-bffa-44ba-8d5d-850cdc03731a.
Council of Science Editors:
de Jong RJ(. Wave transmissions at low-crested structures. Stability of tetrapods at front, crest and rear of a low-crested breakwater. [Masters Thesis]. Delft University of Technology; 1996. Available from: http://resolver.tudelft.nl/uuid:e091d54b-bffa-44ba-8d5d-850cdc03731a
Delft University of Technology
7.
Jiménez Moreno, Alba (author).
Experimental study on the wave overtopping performance of Xbloc+ armour unit.
Degree: 2017, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:b4bbc14f-12db-4858-b9d8-2c1b12dd76c7
► Nowadays, the use of concrete armour units on rubble mound breakwaters designs has become a common practice. Concrete armour units can be placed in a…
(more)
▼ Nowadays, the use of concrete armour units on rubble mound breakwaters designs has become a common practice. Concrete armour units can be placed in a single layer system or in a double layer system and can its placement can be either random or uniform. Recently, Delta Marine Consultants have designed a new armour unit called Xbloc+. This new block is applied as a one layer system and has a regular placement. As Xbloc+ is still under development, preliminary guidance on the performance of this new armour unit is required. This led this research to investigate how Xbloc+ behaves concerning wave overtopping. To analyse wave overtopping, small scale tests were performed in a 2D wave flume. Wave overtopping was measured at a 3Dn distance from the seaward edge of the crest, which is made of rock. In front of the slope there is a flat transition of 0.3m followed by a sloping foreshore of 1/30. In total, 10 series of tests were conducted. In this research, three wave steepness (S
op) were tested (0.02, 0.04 and 0.06) to see the effect of wind waves and swell conditions on the armour layer and tests were performed in two different slope angles (1/2 and 3/4). Each series is formed by several sub tests conducted with increasing wave heights (and wave period in order to maintain a constant wave steepness). Tests were carried out until the failure of the armour slope was reached. Besides, a smooth slope was tested in a 1/2 slope angle to be able to compare smooth and rough results and determine the roughness coefficient of the armour unit more accurately. The test results showed that wave overtopping rates increase exponentially with wave height (H
m0) and wave period (T
m-1,0). Moreover, waves with lower wave steepness (swell conditions) induce higher overtopping discharges as compared to larger wave steepness. Steeper slopes also lead to higher overtopping rates. Therefore, the larger the breaker parameter is, the larger the overtopping discharge results. The influence of the armour roughness and armour permeability is also analysed and it is observed that swell conditions are less affected by these properties. This can be explained by means of the breaker type. Swell conditions are characterized by large surging waves. These waves have a thicker water tongue as compared with other type of breaking (e.g. spilling or plunging) and therefore, they tend to feel the top layer “smoother”. This fact is supported by the analysis of the influence of the roughness coefficient since higher values are obtained for surging waves. In fact, the roughness coefficient ranges between 0.34 and 0.68 showing that, although empirical prediction consider this parameter as a constant, it is dependent on the wave conditions. Concerning the comparison of dimensionless overtopping rate over Xbloc+ armour between test results and empirical prediction, it was found that the present formulae does not give a good estimation due its simplicity. In order to improve the representation of some parameters such as slope angle and…
Advisors/Committee Members: Aarninkhof, Stefan (mentor), Verhagen, Henk Jan (mentor), Kuiper, Coen (mentor), Reedijk, B (mentor), Eggeling, T (mentor), Hofland, Bas (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: Xbloc+; Overtopping; Physical modelling; Breakwater
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APA (6th Edition):
Jiménez Moreno, A. (. (2017). Experimental study on the wave overtopping performance of Xbloc+ armour unit. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:b4bbc14f-12db-4858-b9d8-2c1b12dd76c7
Chicago Manual of Style (16th Edition):
Jiménez Moreno, Alba (author). “Experimental study on the wave overtopping performance of Xbloc+ armour unit.” 2017. Masters Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:b4bbc14f-12db-4858-b9d8-2c1b12dd76c7.
MLA Handbook (7th Edition):
Jiménez Moreno, Alba (author). “Experimental study on the wave overtopping performance of Xbloc+ armour unit.” 2017. Web. 02 Mar 2021.
Vancouver:
Jiménez Moreno A(. Experimental study on the wave overtopping performance of Xbloc+ armour unit. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:b4bbc14f-12db-4858-b9d8-2c1b12dd76c7.
Council of Science Editors:
Jiménez Moreno A(. Experimental study on the wave overtopping performance of Xbloc+ armour unit. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:b4bbc14f-12db-4858-b9d8-2c1b12dd76c7
Delft University of Technology
8.
Laenen, K.C.J. (author).
Een probabilistisch model voor de vergelijking van twee golfbrekertypen op basis van economische optimalisatie.
Degree: Civil Engineering and Geosciences, Hydraulic Engineering, 2000, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:3f96aed6-c00f-415a-944d-b8a2b33d598d
► Breakwaters can be divided into two maintypes: the classic (rubblemound) type breakwater and the vertical (caisson) type breakwater. In general it is assumed that vertical…
(more)
▼ Breakwaters can be divided into two maintypes: the classic (rubblemound) type
breakwater and the vertical (caisson) type
breakwater. In general it is assumed that vertical type breakwaters are more economic than classic type breakwaters, due to the quadratic increase of volume of material needed for the classic type
breakwater as a function of the waterdepth. In addition to the vertical (composed) type
breakwater which has a linear increase. In this study an inquiry has been made to determine the influence of other factors (besides waterdepth) on the economic choice between a classic type
breakwater or a vertical type
breakwater. To make a fair comparison between the two
breakwater types, the influence of the factors on the economic optimal crossection design has been determined. In order to generate economically optimal crossections of both classic and vertical breakwaters an economic optimization model has been made. This model generates, after input of locally dependent hydraulic, geotechnical and economic boundary conditions and material properties, economically optimal crossections for both types of breakwaters. Apart from this the model generates (also for non-economically optimal crossections) total lifetime cost (construction cost and risk), (optimal) chances of failure and material quantities. The model also generates the contribution (in percentage) ofthe different stochastic variables towards the total chance of failure. To determine the risk three scenarios of failure have been taken into account: 1) Transmitted waves behind the
breakwater are too high resulting in a disturbance of the transshipment operation (SLS). 2) Transmitted waves behind the
breakwater are too high so that entrance to the harbour will be prevented (SLS). 3) Collapsing ofthe
breakwater which also leads to a decrease of the protection of the harbour from scenarios 1 and 2 (ULS). In this study the model is applied to an existing case: the Noorderdam
breakwater belonging to the project of extension of Maasvlakte 2, near Hook of Holland. It appears that the totallifetome cost of the classic type
breakwater is 18% higher than the vertical type
breakwater. For both types of breakwaters the total lifetime cost exists of +//-90% construction cost and +/-10% risk. Because of this the economic choice between both types of breakwaters is mainly determined by factors which influence this construction cost. The construction cost for the classic type
breakwater is determined for 50% by the cost ofrubblemound in the core. The construction cost for the vertical type
breakwater is determined for 75% by the cost ofthe concrete in the caisson. The risk of the classic type
breakwater is mainly determined by the occurrence of scenario 1 and for the vertical type
breakwater only by the occurrence of scenario 3. The risk for both types of breakwaters is mainly determined by the uncertainty in the hydraulic boundary conditions. For the Noorderdam
breakwater a sensitivity analysis has been carried out to determine the influence of certain factors on the…
Advisors/Committee Members: Vrijling, J.K. (mentor), De Ridder, H.A.J. (mentor), Tutuarima, W.H. (mentor), Voortman, H.G. (mentor).
Subjects/Keywords: breakwater; optimisation
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APA (6th Edition):
Laenen, K. C. J. (. (2000). Een probabilistisch model voor de vergelijking van twee golfbrekertypen op basis van economische optimalisatie. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:3f96aed6-c00f-415a-944d-b8a2b33d598d
Chicago Manual of Style (16th Edition):
Laenen, K C J (author). “Een probabilistisch model voor de vergelijking van twee golfbrekertypen op basis van economische optimalisatie.” 2000. Masters Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:3f96aed6-c00f-415a-944d-b8a2b33d598d.
MLA Handbook (7th Edition):
Laenen, K C J (author). “Een probabilistisch model voor de vergelijking van twee golfbrekertypen op basis van economische optimalisatie.” 2000. Web. 02 Mar 2021.
Vancouver:
Laenen KCJ(. Een probabilistisch model voor de vergelijking van twee golfbrekertypen op basis van economische optimalisatie. [Internet] [Masters thesis]. Delft University of Technology; 2000. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:3f96aed6-c00f-415a-944d-b8a2b33d598d.
Council of Science Editors:
Laenen KCJ(. Een probabilistisch model voor de vergelijking van twee golfbrekertypen op basis van economische optimalisatie. [Masters Thesis]. Delft University of Technology; 2000. Available from: http://resolver.tudelft.nl/uuid:3f96aed6-c00f-415a-944d-b8a2b33d598d
Delft University of Technology
9.
Patil, Akshay (author).
Numerical investigation of the effect of nappe non-aeration on caisson sliding force during Tsunami breakwater over-topping using OpenFOAM.
Degree: 2018, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:65aff400-8610-4867-92fa-ca33a9e54a01
► During the 2011 Great East Japan Tsunami, the world’s deepest breakwaters in Kamaishi and Ofunato, which had been designed to reduce tsunami damage, partially failed…
(more)
▼ During the 2011 Great East Japan Tsunami, the world’s deepest breakwaters in Kamaishi and Ofunato, which had been designed to reduce tsunami damage, partially failed after over-topping. The failure was due to a combination of sliding, over-topping induced foundation scour and foundation bearing capacity failure. Hindcasting this failure required detailed two-phase (air-water) Computational Fluid Dynamics (CFD) (OpenFOAM in this case) simulation, though uncertainty in the turbulence model used had a large effect on the simulated forces on the breakwater. This study focuses on understanding the physics necessary to correctly model the problem of breakwater over-topping by the tsunami (Bricker et al. 2013). To correctly model the physical behavior of the system, physical model studies were carried out (Mudiyanselage 2017). However, validation of the numerical model will allow easy up-scaling of the flow physics. In order to have complete flexibility in the CFD code while at the same time have sufficient reliability, OpenFOAM will be used. As the physical model studies have already been carried out, this study will only focus on replicating the experimental results in the numerical model. A validation procedure will study the effect of grid size (using grid convergence study) and type of simulation (2-Dimensional/3-Dimensional) used to model the experiment numerically. The final goal of the study is to understand the relationship between the overflowing discharge and the additional force generated due to the non-aeration of the over-flow jet. The entrainment of air from the cavity under the over-flow jet is also of prime interest in this study. Overall, the numerical results indicate that non-aeration could provide about 17.85% additional force leading to failure by sliding/overturning. It was observed that the forcing on the caisson is not constant but cyclic. This is a key result from this study affecting the design of the caisson breakwater. Additionally, the aeration mechanism and overflow jet breakup during the flow were also investigated. A mechanism for aeration of the cavity has been proposed as observed in the numerical model results. However, due to the limited scope of the study and time constraints, further investigations with respect to the overflow discharges was not possible.
Hydraulic Engineering | Environmental Fluid Mechanics
Advisors/Committee Members: Uijttewaal, Wim (mentor), Bricker, Jeremy (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: Breakwater Overtopping; OpenFOAM; CFD modelling
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APA (6th Edition):
Patil, A. (. (2018). Numerical investigation of the effect of nappe non-aeration on caisson sliding force during Tsunami breakwater over-topping using OpenFOAM. (Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:65aff400-8610-4867-92fa-ca33a9e54a01
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Patil, Akshay (author). “Numerical investigation of the effect of nappe non-aeration on caisson sliding force during Tsunami breakwater over-topping using OpenFOAM.” 2018. Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:65aff400-8610-4867-92fa-ca33a9e54a01.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Patil, Akshay (author). “Numerical investigation of the effect of nappe non-aeration on caisson sliding force during Tsunami breakwater over-topping using OpenFOAM.” 2018. Web. 02 Mar 2021.
Vancouver:
Patil A(. Numerical investigation of the effect of nappe non-aeration on caisson sliding force during Tsunami breakwater over-topping using OpenFOAM. [Internet] [Thesis]. Delft University of Technology; 2018. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:65aff400-8610-4867-92fa-ca33a9e54a01.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Patil A(. Numerical investigation of the effect of nappe non-aeration on caisson sliding force during Tsunami breakwater over-topping using OpenFOAM. [Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:65aff400-8610-4867-92fa-ca33a9e54a01
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Delft University of Technology
10.
van Grieken, Jesper (author).
CFD based prediction method for the notional permeability of rubble mound breakwaters.
Degree: 2019, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:c2edbffb-b224-4699-984e-545ade1b8815
► In this thesis, a general method to predict the notional permeability for various structure lay-outs is developed. A numerical model is used to find a…
(more)
▼ In this thesis, a general method to predict the notional permeability for various structure lay-outs is developed. A numerical model is used to find a characteristic value for different structure lay-outs: the three structures for which Van der Meer determined the P-value, and a fourth structure of which the P-value has to be predicted. The P-value of the fourth structure is predicted by interpolation of the characteristic value of this structure between the characteristic values found for the structures of Van der Meer. The numerical model used is the RANS-VOF model OpenFoam. The developed prediction method uses the total wave induced water pressure over the armour layer as characteristic value. The prediction method is validated for a structure lay-out for which (Kik, 2011) found a P-value of 0.37 by means of physical model testing. A P-value of 0.38 was found by (Kluwen, 2012) for the same structure lay-out by means of more physical model testing. The prediction method predicts a P-value in line with the P-value found by (Kik, 2011) and (Kluwen, 2012). The predicted P-value is 0.35 with this prediction method. A sensitivity assessment has been performed by varying the wave conditions, the porosity of the porous layers of the structure and the Forchheimer parameters applied in the numerical simulations. Results show that the prediction is not very sensitive to changes in the wave conditions or changes in the Forchheimer parameters. And although not confirmed by tests, it seems that the prediction method is not very sensitive for changes in the applied porosities of the porous layers of the structure with unknown P-value. Therefore, the method seems to be a robust method and can be practically used in engineering projects. With this new prediction method for the notional permeability of a breakwater, it is possible to make a more accurate estimate on the notional permeability for more complex rubble mound structures. A more accurate estimate of the notional permeability will improve the accuracy of the initial design of the armour layer in early stages of a project. A next step to further improve the predictions of the notional permeability and to gain a better understanding of the damage of the armour layer of a rubble mound breakwater, is to research the correlation between the wave induced water pressure over the armour layer, the discharge through the armour layer and the flow velocity on top of the armour stones and to research how the combination of these three parameters has influence on the armour layer stability.
Civil Engineering | Hydraulic Engineering
Advisors/Committee Members: Aarninkhof, Stefan (mentor), Antonini, Alessandro (mentor), Hofland, Bas (graduation committee), Henrotte, Johan (mentor), van den Bos, Jeroen (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: CFD; Notional Permeability; Breakwater
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APA (6th Edition):
van Grieken, J. (. (2019). CFD based prediction method for the notional permeability of rubble mound breakwaters. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:c2edbffb-b224-4699-984e-545ade1b8815
Chicago Manual of Style (16th Edition):
van Grieken, Jesper (author). “CFD based prediction method for the notional permeability of rubble mound breakwaters.” 2019. Masters Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:c2edbffb-b224-4699-984e-545ade1b8815.
MLA Handbook (7th Edition):
van Grieken, Jesper (author). “CFD based prediction method for the notional permeability of rubble mound breakwaters.” 2019. Web. 02 Mar 2021.
Vancouver:
van Grieken J(. CFD based prediction method for the notional permeability of rubble mound breakwaters. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:c2edbffb-b224-4699-984e-545ade1b8815.
Council of Science Editors:
van Grieken J(. CFD based prediction method for the notional permeability of rubble mound breakwaters. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:c2edbffb-b224-4699-984e-545ade1b8815
Delft University of Technology
11.
Ton, A.M. (author).
Process-based modelling of hydro- and morphodynamics around the Anmok submerged breakwater.
Degree: 2017, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:810e6874-f5a1-4eff-9e77-459b80ebc0cf
► The use of the detached offshore submerged breakwater (SBW) for coastal protection has an increasing popularity due to its low aesthetic impact on the natural…
(more)
▼ The use of the detached offshore submerged breakwater (SBW) for coastal protection has an increasing popularity due to its low aesthetic impact on the natural environment. Submerged breakwaters however have only rarely been adopted and therefore its efficacy remains largely unknown (Ranasinghe et al. 2010). Shoreline erosion has been reported in the lee of submerged breakwaters in several field observations and therefore a better understanding of the characteristics of the shoreline response to submerged breakwaters is required. In this thesis insight is gained in the hydrodynamic patterns and the associated morphological response around a constructed submerged breakwater at the frequently monitored field site Anmok beach and in general the capability to reliably simulate coastal morphological response to submerged breakwaters is developed. In addition better understanding on modelling severe wave conditions in Delft3D has led to new possibilities with this model.
Civil Engineering and Geosciences
Hydraulic Engineering
Advisors/Committee Members: Reniers, A.J.H.M. (mentor), Ranasinghe, R. (mentor), Luijendijk, A.P. (mentor), Hofland, B. (mentor).
Subjects/Keywords: Morphodynamics; Submerged breakwater; Delft3D; hydrodynamics
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APA (6th Edition):
Ton, A. M. (. (2017). Process-based modelling of hydro- and morphodynamics around the Anmok submerged breakwater. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:810e6874-f5a1-4eff-9e77-459b80ebc0cf
Chicago Manual of Style (16th Edition):
Ton, A M (author). “Process-based modelling of hydro- and morphodynamics around the Anmok submerged breakwater.” 2017. Masters Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:810e6874-f5a1-4eff-9e77-459b80ebc0cf.
MLA Handbook (7th Edition):
Ton, A M (author). “Process-based modelling of hydro- and morphodynamics around the Anmok submerged breakwater.” 2017. Web. 02 Mar 2021.
Vancouver:
Ton AM(. Process-based modelling of hydro- and morphodynamics around the Anmok submerged breakwater. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:810e6874-f5a1-4eff-9e77-459b80ebc0cf.
Council of Science Editors:
Ton AM(. Process-based modelling of hydro- and morphodynamics around the Anmok submerged breakwater. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:810e6874-f5a1-4eff-9e77-459b80ebc0cf
Delft University of Technology
12.
Janssen, Danny (author).
Stability analysis of XblocPlus crest element.
Degree: 2018, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:cfc871cd-261e-4f8f-88a2-ebb17d2c3b8f
► In the past humans used to protect their shores mainly with rocks. In the past decades the shore protections did gently shift to concrete element…
(more)
▼ In the past humans used to protect their shores mainly with rocks. In the past decades the shore protections did gently shift to concrete element protections. An example of an often applied concrete armour unit is the Xbloc. This element is quite strong and well investigated. BAM Infraconsult has developed a uniformly placed armor unit, the XblocPlus. The new XblocPlus is placed in a regular pattern, which is easier for contractors to construct. A design detail of a XblocPlus armor layer which still needs some attention is the transition from the slope to the crest. The elements are placed in horizontal rows, locked in place by two elements in the row above and two elements in the row below. However, the upper element is not supported by any element above it, leading to less interlocking. This study focusses on the physical processes which lead to (in)stability of the upper element and tries to increase this stability. First, physical laboratory tests were performed with the main aim to visually observe the failure methods of the upper XblocPlus element. After the initial tests, a computational fluid dynamic model was built with the aim to get a better insight in the load distribution on a single XblocPlus element under wave impact. To increase the stability of the element as much as possible, several increments to the stability of the upper element are proposed. The first method which increases the stability of the element is to cover the back of the element with rock, this changes the rotation point of the element backwards which increases the wave load required to initiate rocking. A second possibility is to face the top of the upper element downward, this does decrease the drag on the element. A third possibility is to face the top of the upper element upward, this leads to a higher drag on the upper element. However, this orientation makes it possible to bury the element in a rock backfill, increasing the weight of the element. This thesis did slightly research the applicability of CFD models to concrete armor design. The main conclusion for this trial is that it is possible to apply numerical models for the design of breakwaters, however physical model tests are still required to validate the obtained data from the numerical model, since the flow around a coastal structure is that complex, it only estimates the loads in the right order of magnitude when not validated. The validity of the model can be increased by calibrating the soil parameters using measured pressures in the different layers of the
breakwater. To increase the accuracy of a numerical model, one could construct a three dimensional structure, which requires much computational grid cells, making the computational demand of the system quite high.
Advisors/Committee Members: Aarninkhof, Stefan (mentor), Hofland, Bas (mentor), van den Bos, Jeroen (mentor), Reedijk, B (mentor), Eggeling, T (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: XblocPlus; OpenFOAM; Crest; Breakwater
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APA ·
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APA (6th Edition):
Janssen, D. (. (2018). Stability analysis of XblocPlus crest element. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:cfc871cd-261e-4f8f-88a2-ebb17d2c3b8f
Chicago Manual of Style (16th Edition):
Janssen, Danny (author). “Stability analysis of XblocPlus crest element.” 2018. Masters Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:cfc871cd-261e-4f8f-88a2-ebb17d2c3b8f.
MLA Handbook (7th Edition):
Janssen, Danny (author). “Stability analysis of XblocPlus crest element.” 2018. Web. 02 Mar 2021.
Vancouver:
Janssen D(. Stability analysis of XblocPlus crest element. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:cfc871cd-261e-4f8f-88a2-ebb17d2c3b8f.
Council of Science Editors:
Janssen D(. Stability analysis of XblocPlus crest element. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:cfc871cd-261e-4f8f-88a2-ebb17d2c3b8f
Delft University of Technology
13.
Van Buchem, R.V. (author).
Stability of a single top layer of cubes.
Degree: 2009, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:e32b33dc-7b64-4777-b32e-40f2c79e03a3
► In an attempt to reduce the cost of breakwaters, several elements have been developed. Examples are Accropodes, Tetrapods and concrete cubes. Previous tests were performed…
(more)
▼ In an attempt to reduce the cost of breakwaters, several elements have been developed. Examples are Accropodes, Tetrapods and concrete cubes. Previous tests were performed with armour layers consisting of a double layer of cubes. This study is based on a single layer of cubes. The great benefit of a single layer of cubes is that it reduces the total cost of concrete. Another benefit is that because of the shape, cubes are easy to prefabricate. Three important aspects considering the stability of a single armour layer of a
breakwater consisting of concrete cubes are addressed: The influence of the wave steepness on the stqbility, the influence of the slope on the stability of the single armour layer, and the influence of the packing density on the stability of the single armour layer. This study is based on a literature study and the results from a test program including a small-scale physical model tests. All conclusions in this thesis have been based on model tests, in which the cubes were placed by hand and placed in a stretching bond (half-steensverband). In total eighteen tests were performed in the wave flume of the Fluid Mechanics Laboratory of the Faculty of Civil Engineering and Geosciences. Two different slopes were tested together with three different packing densities and three different wave steepness. It was found that the gentler slope did not contribute to the stability in this setting using a stretching bond. In fact the model failed earlier than the model with a steeper slope in most cases. The best results were found using a slope of cot? = 1.5. Secondly, the influence of the packing density showed varying failure mechanism. When applying a large packing density (np = 0.20) the damage occurred below SWL. Contrary to small packing densities (np = 0.35) where damage occurred higher than SWL. It was found that, from the tested packing densities, a packing density of 0.28 gives the best results for both slopes. This conclusion is conform the findings of previous tests [Van Gent et al, 1999]. During these tests an optimum packing density of np = 0.25 – 0.30 was found. Although the cubes were placed randomly in the tests of Van Gent. In this study the cubes were placed in a stretching bond. Finally it was found that a wave steepness of s0p = 0.04-0.05 causes minimum stability for the armour layer. The tests with a single armour layer of cubes placed in a stretching bond indicated that high sta-bility numbers (Hs/?Dn) can be reached before failure occurs (Nod > 0.2). the tests show that sta-bility numbers as high as 4.5 can be realized before Nod > 0.2 is reached. This study shows that the use of a single top layer of cubes is feasible. The top layer becomes very stable when placed in a stretching bond. In this configuration it is recommended to use a single top layer of cubes instead of a double top layer of cubes. The results during the tests seem to have a strong correlation with pitched stones. Therefore the black box model as well as the analytical method for pitched stones (6-xi-rule) is treated in…
Advisors/Committee Members: Verhagen, H.J. (mentor), Stive, M.J.F. (mentor).
Subjects/Keywords: breakwater; cubes
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APA ·
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Manager
APA (6th Edition):
Van Buchem, R. V. (. (2009). Stability of a single top layer of cubes. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:e32b33dc-7b64-4777-b32e-40f2c79e03a3
Chicago Manual of Style (16th Edition):
Van Buchem, R V (author). “Stability of a single top layer of cubes.” 2009. Masters Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:e32b33dc-7b64-4777-b32e-40f2c79e03a3.
MLA Handbook (7th Edition):
Van Buchem, R V (author). “Stability of a single top layer of cubes.” 2009. Web. 02 Mar 2021.
Vancouver:
Van Buchem RV(. Stability of a single top layer of cubes. [Internet] [Masters thesis]. Delft University of Technology; 2009. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:e32b33dc-7b64-4777-b32e-40f2c79e03a3.
Council of Science Editors:
Van Buchem RV(. Stability of a single top layer of cubes. [Masters Thesis]. Delft University of Technology; 2009. Available from: http://resolver.tudelft.nl/uuid:e32b33dc-7b64-4777-b32e-40f2c79e03a3
Delft University of Technology
14.
Drouen, Niels (author).
Stability of Single-Layer Cubes on Lee-Side of Breakwaters: Quantative Research on the Stability of a Single Cubic Armour Layer on the Lee-Side of Breakwaters using a Wave Overtopping Simulator.
Degree: 2018, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:9cf682e5-0821-47a7-a616-f45a102e1c46
► Breakwaters are hydraulic structures used to create calm and steady environments for moored ships in harbors. They dampen the wave by dissipating the energy through…
(more)
▼ Breakwaters are hydraulic structures used to create calm and steady environments for moored ships in harbors. They dampen the wave by dissipating the energy through wave breaking. Most studies of breakwaters have only been carried out on the seaward slope of the structure. However, few have conducted research on the landward-, inner-, slope of breakwaters. The existing accounts re all empirical design formulae, commonly denoted as applicable for conceptual design. Improvement of the design of the armour layer of the inner slope leads to economical advantages.This research focused on three main goals: (1) Presenting a theoretical methodology for the waves tested, (2) It veried the Wave Overtopping Simulator as built by Rietmeijer (2017) and (3) Performed stability tests for the inner slope by conducting physical model tests in the Fluid Mechanics Laboratory of Delft University of Technology. The first goal of this research has been to develop a theoretical approach to overtopping waves in combination with a simulator. This has been done by linking certain storm characteristics, being the significant wave height Hs and peak period Tp to wave characteristics; water volume, water layer thickness and the front velocity of the water body. These three combined lead to an impinging wave on the rear slope causing damage. Subsequently the storms have been altered to only select the highest percentage of waves, since these were marked as extreme storm conditions. This resulted in dierent signicant wave heights which were tested. To verify the Wave Overtopping Simulator tests have been performed and specic elements have been measured and analyzed. This has resulted in relationships between theoretical wave characteristics and simulator settings. The relationships are the required water level in the reservoir to obtain a certain front velocity of the water body. To adjust the water layer thickness the valve settings have been changed. For a specic volume the overtopping period has been altered. These three elements have been measured using wave gauges and a high speed camera after which the data was carefully analyzed. The stability tests have been executed using a model of a
breakwater in the Fluid Mechanics Laboratory of Delft University of Technology. Results of the preparatory calculations together with results obtained from former research have led to the design of the test set-up. A single armour layer of 20 mm cubes with an porosity of nearly 40% was built with an fixed toe. This configuration was tested with increasing storm intensities until failure. Subsequently the damage has been measured using photo camera's and laser technique. This research has successfully verified the wave overtopping simulator by measuring individual waves and their specific discharge, water layer thickness and velocity. These measurements have been compared to an other method, using a high speed camera. The found values have been checked with found literature and it has been concluded that the Wave…
Advisors/Committee Members: Uijttewaal, Wim (mentor), Hofland, Bas (mentor), Kuiper, Coen (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: Breakwater; Overtopping; Waves; Single layer
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APA (6th Edition):
Drouen, N. (. (2018). Stability of Single-Layer Cubes on Lee-Side of Breakwaters: Quantative Research on the Stability of a Single Cubic Armour Layer on the Lee-Side of Breakwaters using a Wave Overtopping Simulator. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:9cf682e5-0821-47a7-a616-f45a102e1c46
Chicago Manual of Style (16th Edition):
Drouen, Niels (author). “Stability of Single-Layer Cubes on Lee-Side of Breakwaters: Quantative Research on the Stability of a Single Cubic Armour Layer on the Lee-Side of Breakwaters using a Wave Overtopping Simulator.” 2018. Masters Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:9cf682e5-0821-47a7-a616-f45a102e1c46.
MLA Handbook (7th Edition):
Drouen, Niels (author). “Stability of Single-Layer Cubes on Lee-Side of Breakwaters: Quantative Research on the Stability of a Single Cubic Armour Layer on the Lee-Side of Breakwaters using a Wave Overtopping Simulator.” 2018. Web. 02 Mar 2021.
Vancouver:
Drouen N(. Stability of Single-Layer Cubes on Lee-Side of Breakwaters: Quantative Research on the Stability of a Single Cubic Armour Layer on the Lee-Side of Breakwaters using a Wave Overtopping Simulator. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:9cf682e5-0821-47a7-a616-f45a102e1c46.
Council of Science Editors:
Drouen N(. Stability of Single-Layer Cubes on Lee-Side of Breakwaters: Quantative Research on the Stability of a Single Cubic Armour Layer on the Lee-Side of Breakwaters using a Wave Overtopping Simulator. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:9cf682e5-0821-47a7-a616-f45a102e1c46
Delft University of Technology
15.
Jantzen, Casper (author).
Experimental study on the influence of bed protections on scour depth and scour development in front of sloped embankments.
Degree: 2020, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:e0f7c1fc-60ea-441e-b3c8-40c0b29c0965
► On the seabed in front of coastal structures sediment movement takes place due to incoming waves. The erosion of sediments creates a scour hole at…
(more)
▼ On the seabed in front of coastal structures sediment movement takes place due to incoming waves. The erosion of sediments creates a scour hole at the toe of structures such as embankments, breakwaters and dikes. This scour hole may lead to instabilities in the main structure due to material sliding into this hole. A common method of protecting against scour is the placement of a rubble mound toe structure and bed protection. The goal of this study is to better understand the background and main parameters that leads to scour, to predict the (location of the) maximum scour depth and how this is influenced by the bed protection. Consequently, the main research question of this thesis is: What is the expected, wave induced, scour depth over time in front of a sloped embankment, and what is the effect of a scour protection on the (location of the) maximum scour depth?
Civil Engineering | Hydraulic Engineering
Advisors/Committee Members: Hofland, B. (mentor), Kuiper, C. (mentor), de Schipper, M.A. (graduation committee), Ockeloen, Wouter (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: Scour; Coastal; Breakwater; Embankment
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APA (6th Edition):
Jantzen, C. (. (2020). Experimental study on the influence of bed protections on scour depth and scour development in front of sloped embankments. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:e0f7c1fc-60ea-441e-b3c8-40c0b29c0965
Chicago Manual of Style (16th Edition):
Jantzen, Casper (author). “Experimental study on the influence of bed protections on scour depth and scour development in front of sloped embankments.” 2020. Masters Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:e0f7c1fc-60ea-441e-b3c8-40c0b29c0965.
MLA Handbook (7th Edition):
Jantzen, Casper (author). “Experimental study on the influence of bed protections on scour depth and scour development in front of sloped embankments.” 2020. Web. 02 Mar 2021.
Vancouver:
Jantzen C(. Experimental study on the influence of bed protections on scour depth and scour development in front of sloped embankments. [Internet] [Masters thesis]. Delft University of Technology; 2020. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:e0f7c1fc-60ea-441e-b3c8-40c0b29c0965.
Council of Science Editors:
Jantzen C(. Experimental study on the influence of bed protections on scour depth and scour development in front of sloped embankments. [Masters Thesis]. Delft University of Technology; 2020. Available from: http://resolver.tudelft.nl/uuid:e0f7c1fc-60ea-441e-b3c8-40c0b29c0965
Delft University of Technology
16.
Damdam, Khaled (author).
A Combined Breakwaters System: A Wave Attenuation Study on the Combination of Submerged and Floating Breakwaters using REEF3D.
Degree: 2019, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:7b1912f0-bde6-4953-b8ae-ad4a37419817
► Coastal zones have been a dynamic area and most favoured locations utilized for living, leisure, recreational activities, tourism, commerce and many other human activities. Submerged…
(more)
▼ Coastal zones have been a dynamic area and most favoured locations utilized for living, leisure, recreational activities, tourism, commerce and many other human activities. Submerged and floating breakwaters have been used as effective systems to protect these zones from wave attack. However, they are only effectively functional if the incident wave height is relatively low. Under such condition, these systems can reduce the wave transmission with significant wave dissipation and hence achieving a desirable tranquillity in designated areas. Therefore, the focus of this research is mainly to investigate the possibility of using a combination of a submerged porous breakwater (SBW) with a floating breakwater (FBW) as an innovative coastal protection system that can provide adequate calm conditions in the coastal zones with minimum visual impact. This study utilizes the open-source CFD model, REEF3D to simulate such wave-structure interaction. This CFD model is based on the RANS equations coupled with the level set method and the k − ω turbulence model. In the present study, the first section deals with the simulation of irregular wave breaking over an irregular bed profile with the use of wave reconstruction method to generate irregular waves. An excellent agreement between the computed results and the experimental data is obtained showing that REEF3D model is capable of capturing the dominant features of the evolution of the wave breaking process, both in the shoaling region and the surf zone. The second section deals with the simulation of regular wave interaction with the SBW. The simulation is conducted using the VRANS method to resolve the porous flow. The wave interaction with the SBW is validated by comparison with experimental data. An impressive agreement between the numerical results and the experimental data is achieved with very small RMSE values. Finally, the validated model is then used to simulate the combination of the SBW and the FBW. Three different cases are investigated with three different spacing between these structures. For each case, five different configurations related to the geometry of the FBW are simulated. It is found out that an effective reduction of more than 90%, on average, of the incident wave height, can be achieved for this combined breakwaters system. This means that a transmission coefficient (Kt) of less than 10% is calculated across this combination. Besides, it is found out that 1.75 FBW length to wavelength (L/λ) ratio produces a very low transmission coefficient (Kt). Further, an effective distance of 1-2 wavelength between the SBW and the FBW subsystems can also result in lower transmission coefficients (Kt).
Coastal and Marine Engineering and Management
Advisors/Committee Members: Bihs, Hans (mentor), Kamath, Arun (graduation committee), Delft University of Technology (degree granting institution), Norwegian University of Science and Technology (NTNU) (degree granting institution).
Subjects/Keywords: CoMEM; REEF3D; Wave-structure interaction; Wave Attenuation; Submerged Breakwater; Floating Breakwater
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APA (6th Edition):
Damdam, K. (. (2019). A Combined Breakwaters System: A Wave Attenuation Study on the Combination of Submerged and Floating Breakwaters using REEF3D. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:7b1912f0-bde6-4953-b8ae-ad4a37419817
Chicago Manual of Style (16th Edition):
Damdam, Khaled (author). “A Combined Breakwaters System: A Wave Attenuation Study on the Combination of Submerged and Floating Breakwaters using REEF3D.” 2019. Masters Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:7b1912f0-bde6-4953-b8ae-ad4a37419817.
MLA Handbook (7th Edition):
Damdam, Khaled (author). “A Combined Breakwaters System: A Wave Attenuation Study on the Combination of Submerged and Floating Breakwaters using REEF3D.” 2019. Web. 02 Mar 2021.
Vancouver:
Damdam K(. A Combined Breakwaters System: A Wave Attenuation Study on the Combination of Submerged and Floating Breakwaters using REEF3D. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:7b1912f0-bde6-4953-b8ae-ad4a37419817.
Council of Science Editors:
Damdam K(. A Combined Breakwaters System: A Wave Attenuation Study on the Combination of Submerged and Floating Breakwaters using REEF3D. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:7b1912f0-bde6-4953-b8ae-ad4a37419817
Delft University of Technology
17.
Woerlee, Sebastiaan (author).
Breakwater layout optimisation using a parametric model: Development of a decision-making tool for the conceptual design of breakwaters.
Degree: 2019, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:8edbb19c-229d-4a22-a0ac-4db47f90a297
► Nowadays, conceptual breakwater layout design mostly relies on experience and expert judgement, making it complicated to demonstrate that an economic optimum has been reached. This…
(more)
▼ Nowadays, conceptual
breakwater layout design mostly relies on experience and expert judgement, making it complicated to demonstrate that an economic optimum has been reached. This stresses the need to develop a tool that is able to establish the economically most attractive
breakwater layout for a certain set of requirements and site-specific data. This study provides a proof of concept for a generative
breakwater layout design tool, applicable to port projects all around the world. This is accomplished by investigating the most suitable optimisation method, by setting up a universally applicable methodology for the determination of the economic optimum and by establishing a robust and flexible model set-up. By validating it against a real case, the parametric model consistently comes up with
breakwater layouts having cost estimates that are located within the desired accuracy range for the conceptual design phase. In addition, the parametric model is flexible, as it is able to efficiently deal with changes in design requirements and future port developments, therewith living up to modern design standards. In this way, client expectations are more likely to be met, leading to a spiral of increasing trust between the involved parties in an early design stage.
Advisors/Committee Members: Aarninkhof, Stefan (mentor), Parkinson, Chris (mentor), van Overeem, Jan (mentor), Lansen, Joost (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: Breakwater; Breakwater Layout; Genetic Algorithms; Port layout; Downtime; Optimisation; Container Port
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APA ·
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Export
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APA (6th Edition):
Woerlee, S. (. (2019). Breakwater layout optimisation using a parametric model: Development of a decision-making tool for the conceptual design of breakwaters. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:8edbb19c-229d-4a22-a0ac-4db47f90a297
Chicago Manual of Style (16th Edition):
Woerlee, Sebastiaan (author). “Breakwater layout optimisation using a parametric model: Development of a decision-making tool for the conceptual design of breakwaters.” 2019. Masters Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:8edbb19c-229d-4a22-a0ac-4db47f90a297.
MLA Handbook (7th Edition):
Woerlee, Sebastiaan (author). “Breakwater layout optimisation using a parametric model: Development of a decision-making tool for the conceptual design of breakwaters.” 2019. Web. 02 Mar 2021.
Vancouver:
Woerlee S(. Breakwater layout optimisation using a parametric model: Development of a decision-making tool for the conceptual design of breakwaters. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:8edbb19c-229d-4a22-a0ac-4db47f90a297.
Council of Science Editors:
Woerlee S(. Breakwater layout optimisation using a parametric model: Development of a decision-making tool for the conceptual design of breakwaters. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:8edbb19c-229d-4a22-a0ac-4db47f90a297
18.
Sreenivasa Reddy, K.
Hydrodynamic studies on vertical wall, low-crested rubble
mound and semi-circular barrier system; -.
Degree: Engineering, 2013, Andhra University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/8723
► Coastal problems related to erosion and flooding are the outcome of the dominant wave climate in the area, in combination with currents, tides and storm…
(more)
▼ Coastal problems related to erosion and flooding
are the outcome of the dominant wave climate in the area, in
combination with currents, tides and storm surges. Further, an
increasing hazard to the coastline is the development which alters
the coast through the construction of buildings and
infrastructures, and in so doing, interrupts the natural sediment
deposition processes and wave regime. Additionally, the global
climate change is causing a rise in sea-level and intensified
storminess, which is yet another factor in beach erosion and
flooding. Aftermath effects of recent devastating Tsunami on Indian
coast alarmed the coastal engineers renew their designs for coastal
management and protection systems. The creation of various coastal
defence structures which protect coastlines through the reduction
of the afore-mentioned problems is thus extremely important; an
importance which has significantly increased during the last few
decades along with amplified pressure on the coastal zone. The most
commonly used coastal engineering tool is the seawall. Today,
vertical walls (seawalls) armor much of the developed shoreline.
Many have done their job admirably, protecting important
establishments such as heavy industries, power plants, national
highways, habitations etc., that otherwise could have probably
tumbled in to the sea. More importantly, the beaches would become
narrow and eventually be eliminated. Essentially, a seawall acts as
a layer between the vulnerable coastline and the ocean. Extreme
wave action is supported by the seawall without eroding the coast,
although the seawall itself will eventually break down and requires
repair or replacement. These walls also help to insulate
communities from flooding, although high waves can still breach
most seawalls. Low-crested structures such as submerged breakwaters
or artificial reefs present advantages compared to other types of
coastal structures due to their low height and permeable nature.
Firstly, due to the low freeboard.
References p.94-101
Advisors/Committee Members: Muni Reddy, M G.
Subjects/Keywords: energy loss over low-crested breakwater; Low-crested breakwater; semi-circular perforated breakwater; vertical wall; pool length; wave transmission; Civil Engineering
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APA (6th Edition):
Sreenivasa Reddy, K. (2013). Hydrodynamic studies on vertical wall, low-crested rubble
mound and semi-circular barrier system; -. (Thesis). Andhra University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/8723
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Sreenivasa Reddy, K. “Hydrodynamic studies on vertical wall, low-crested rubble
mound and semi-circular barrier system; -.” 2013. Thesis, Andhra University. Accessed March 02, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/8723.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sreenivasa Reddy, K. “Hydrodynamic studies on vertical wall, low-crested rubble
mound and semi-circular barrier system; -.” 2013. Web. 02 Mar 2021.
Vancouver:
Sreenivasa Reddy K. Hydrodynamic studies on vertical wall, low-crested rubble
mound and semi-circular barrier system; -. [Internet] [Thesis]. Andhra University; 2013. [cited 2021 Mar 02].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/8723.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sreenivasa Reddy K. Hydrodynamic studies on vertical wall, low-crested rubble
mound and semi-circular barrier system; -. [Thesis]. Andhra University; 2013. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/8723
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
NSYSU
19.
Lin, I-Fu.
Study on Three-Dimensional Hydrodynamic Characteristics around the Head of Breakwater.
Degree: PhD, Marine Environment and Engineering, 2017, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0530117-171507
► Breakwaters are the maritime structures which are generally extending to both sides of the ship channel. Their main functions are to create the shelter, prevent…
(more)
▼ Breakwaters are the maritime structures which are generally extending to both sides of the ship channel. Their main functions are to create the shelter, prevent the heavy seas, and maintain the stability of the harbor basin to ensure safety of navigation and cargo operation. The Port of Taichung and the Port of Mailiao are the important ports in the middle of the west coast of Taiwan. According to the results of the sounding datum survey in 2014, the maximum depth of the seabed scouring in the vicinity of these two ports found was 26 m, and part of the amors of
breakwater have been collapsed and backwards. Therefore, it is a top priority task to take appropriate responses and improving measures.
In this paper, three dimensional numerical simulations of wave-current fields around both heads of breakwaters of the Port of Taichung and the Port of Mailiao were carried out. The purpose is to explore and analyze the characteristics and scouring mechanism around the head of
breakwater. The boundary conditions and initial inputs were established by using statistics to analyze background data and compare with the wave-current and seabed scouring characteristics of this research. The tools applied in the research are FAVORTM, wave, tide, turbulence and scouring modules in the Computational Fluid Dynamics (CFD) software FLOW-3DâR which calculate hydrodynamics.
The results show that numerical simulations of flow hydrodynamics of wave-flow field is consistented with field observations and laboratory experiments. By visualizing, it distributes the free surface wave, vertical flow conditions, and the maximum orbital velocity at the seabed that shear in the eddy area to clarify the scouring mechanism around the head of
breakwater. Including the wave-induced flow field, along a north-south trend of the flooding and ebb current, and the steep slope formed together. Because the wave propagation is blocked by the
breakwater, the accumulated hydrodynamic energy turns to the deep sea and cause of band-like offshore flow mixed with the southward forward wave, which deepen the turbulence mechanism of the seabed boundary layer. Turbulence mechanism by the suspension load, with the trend and move away. Due to the lack of long-term lack of sand source, the scouring area is difficult to achieve balance of siltation, thus continue to threaten the stability of the
breakwater structure.
Advisors/Committee Members: Tai-Wen Hsu (chair), Chung-Pan Lee (committee member), Yang-Yih Chen (chair), I-Fan Tseng (committee member), Ching-Piao Tsai (chair), Jaw-Fang Lee (chair), Der-Chang Lo (chair).
Subjects/Keywords: Breakwater; scouring; hydrodynamics; Computational Fluid Dynamics; Turbulent
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APA (6th Edition):
Lin, I. (2017). Study on Three-Dimensional Hydrodynamic Characteristics around the Head of Breakwater. (Doctoral Dissertation). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0530117-171507
Chicago Manual of Style (16th Edition):
Lin, I-Fu. “Study on Three-Dimensional Hydrodynamic Characteristics around the Head of Breakwater.” 2017. Doctoral Dissertation, NSYSU. Accessed March 02, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0530117-171507.
MLA Handbook (7th Edition):
Lin, I-Fu. “Study on Three-Dimensional Hydrodynamic Characteristics around the Head of Breakwater.” 2017. Web. 02 Mar 2021.
Vancouver:
Lin I. Study on Three-Dimensional Hydrodynamic Characteristics around the Head of Breakwater. [Internet] [Doctoral dissertation]. NSYSU; 2017. [cited 2021 Mar 02].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0530117-171507.
Council of Science Editors:
Lin I. Study on Three-Dimensional Hydrodynamic Characteristics around the Head of Breakwater. [Doctoral Dissertation]. NSYSU; 2017. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0530117-171507
20.
Rodrigues, João Carlos Lage.
Controlo fotogramétrico da condição de estruturas quebra-mar.
Degree: 2014, Repositório Científico do Instituto Politécnico de Lisboa
URL: http://www.rcaap.pt/detail.jsp?id=oai:repositorio.ipl.pt:10400.21/4468
► Dissertação de natureza Científica para obtenção do grau de Mestre em Engenharia Civil
A necessidade de zonas de abrigo em áreas costeiras leva à criação…
(more)
▼ Dissertação de natureza Científica para obtenção do grau de Mestre em Engenharia Civil
A necessidade de zonas de abrigo em áreas costeiras leva à criação de estruturas como os quebra mares, sendo o seu dimensionamento habitualmente realizado através de fórmulas semi-empíricas e baseadas na experiência do projetista. Para a confirmação da eficácia do dimensionamento recorre-se a ensaios em modelo reduzido.
No núcleo de Portos e Estruturas Marítimas do Laboratório Nacional de Engenharia Civil são feitos vários ensaios em modelo reduzido, em canais (bidimensionais) e em tanques (tridimensionais). Nestes ensaios, é feita a avaliação do dano provocado, com a contagem e sinalização das zonas onde existem alterações no quebra-mar, designadamente onde ocorreram quedas dos elementos que constituem o manto.
Esta análise, quando não automatizada, é algo subjetiva, podendo existir algumas quedas impercetíveis para o observador. Adicionalmente é também suscetível ao fator de cansaço do mesmo. A fotogrametria tem vindo a ser implementada como um novo meio de monitorização, uma vez que a recolha e análise de fotografias é um procedimento rápido e económico.
Neste trabalho desenvolveram-se técnicas de análise fotogramétrica, com vista à sua aplicação em fotografias, fornecidas pelo LNEC, referentes a um ensaio real. Em resposta ao solicitado, são identificadas as zonas de quedas e movimentos e registadas na memória fotográfica do ensaio do quebra-mar. Foram aplicadas técnicas matemáticas para estabelecer os procedimentos de análise das fotografias, permitindo avaliar as alterações ocorridas entre dois momentos registados.
Os procedimentos foram desenvolvidos usando o Scilab, sendo no entanto, apresentados os algoritmos que permitem a sua implementação em qualquer outra plataforma ou linguagem de programação. Da aplicação dos procedimentos desenvolvidos resultam: a quantificação e a marcação da área alterada, assim como a possibilidade de avaliação das translações sofridas pelos blocos artificiais que constituem o manto.
The need for shelter zones in coastal áreas leads to the construction of structures for shore protection such as breakwaters. Its design is mainly made based in semi-empirical formulas and in the experience of project designer. However the effectiveness of the breakwater is made by physical modelling.
Several experiments to test this effectiveness in bidimensional and tridimensional models are carried out at the Núcleo de Portos e Estruturas Marítimas of the Laboratório Nacional de Engenharia Civil (LNEC).
Through these experiments, i tis possible to test the stability of the breakwater and the evaluation of damage is made by couting the armor units dislocated (movements or displacements). As this damage evaluation is not na automated procedure, but i tis based on a visual inspection of the breakwater status before and after the experiments, i tis highly man-dependent. Therefore the presente evaluation process is subjective and some movements may go unnotice.
The presente method requires a loto f analyzing…
Advisors/Committee Members: Loja, Maria Amélia Ramos, Rodrigues, José Alberto de Sousa, Lemos, Rute Maria Gomes de.
Subjects/Keywords: quebra-mar; Fotogrametria; Breakwater; Photogrammetric techniques
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APA (6th Edition):
Rodrigues, J. C. L. (2014). Controlo fotogramétrico da condição de estruturas quebra-mar. (Thesis). Repositório Científico do Instituto Politécnico de Lisboa. Retrieved from http://www.rcaap.pt/detail.jsp?id=oai:repositorio.ipl.pt:10400.21/4468
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Rodrigues, João Carlos Lage. “Controlo fotogramétrico da condição de estruturas quebra-mar.” 2014. Thesis, Repositório Científico do Instituto Politécnico de Lisboa. Accessed March 02, 2021.
http://www.rcaap.pt/detail.jsp?id=oai:repositorio.ipl.pt:10400.21/4468.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Rodrigues, João Carlos Lage. “Controlo fotogramétrico da condição de estruturas quebra-mar.” 2014. Web. 02 Mar 2021.
Vancouver:
Rodrigues JCL. Controlo fotogramétrico da condição de estruturas quebra-mar. [Internet] [Thesis]. Repositório Científico do Instituto Politécnico de Lisboa; 2014. [cited 2021 Mar 02].
Available from: http://www.rcaap.pt/detail.jsp?id=oai:repositorio.ipl.pt:10400.21/4468.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Rodrigues JCL. Controlo fotogramétrico da condição de estruturas quebra-mar. [Thesis]. Repositório Científico do Instituto Politécnico de Lisboa; 2014. Available from: http://www.rcaap.pt/detail.jsp?id=oai:repositorio.ipl.pt:10400.21/4468
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Delft University of Technology
21.
van Lent, E.G. (author).
Modeling Potential Liquefaction during an Earthquake under a Breakwater with PM4Sand.
Degree: 2020, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:147aded2-e17e-4d24-ab7b-661bd1d8818c
► The stability of breakwaters in seismically active areas is not always guaranteed. A new approach to model a breakwater subjected to an earthquake is with…
(more)
▼ The stability of breakwaters in seismically active areas is not always guaranteed. A new approach to model a
breakwater subjected to an earthquake is with PM4Sand. The goal of this research is to find if breakwaters subjected to earthquakes can be correctly modelled with PM4Sand. To investigate PM4Sand a
breakwater subjected to an earthquake on centrifuge scale is modelled in Plaxis. The soils of the centrifuge test are modelled with PM4Sand and UBCSand. After calibrating the soil parameters and incorporating the proper earthquake signal results are generated and compared. The investigated results focus on the settlements of the caisson, deformations of the
breakwater and generated Excess Pore Water Pressures underneath the
breakwater due to the earthquake. Comparing the results from the numerical models with the centrifuge test result show that both the UBCSand model and PM4Sand can give comparable results for the settlements and deformations. However, both UBCSand and PM4Sand were not able to give the correct EPWP development underneath the
breakwater. Due to the incorrect behaviour of the EPWP underneath the
breakwater resulting from the numerical models, this research is not able to conclude that PM4Sand can be used for modelling breakwaters subjected to earthquakes. Further research is needed to investigate the development of EPWP underneath the
breakwater during an earthquake. Focus points of future research can be: the influence of the amplitude of an earthquake signal on the EPWP, the influence of modelling a centrifuge test on the behaviour of the EPWP and the influence of the initial static shear stress on the EPWP development.
Advisors/Committee Members: Vardon, P.J. (mentor), Brinkgreve, R.B.J. (graduation committee), Hicks, M.A. (graduation committee), Lanzafame, R.C. (graduation committee), Lubking, P. (graduation committee), van Herpen, F. (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: PM4Sand; Breakwater; Earthquake; UBCSand; Liquefaction; Plaxis 2D
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APA (6th Edition):
van Lent, E. G. (. (2020). Modeling Potential Liquefaction during an Earthquake under a Breakwater with PM4Sand. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:147aded2-e17e-4d24-ab7b-661bd1d8818c
Chicago Manual of Style (16th Edition):
van Lent, E G (author). “Modeling Potential Liquefaction during an Earthquake under a Breakwater with PM4Sand.” 2020. Masters Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:147aded2-e17e-4d24-ab7b-661bd1d8818c.
MLA Handbook (7th Edition):
van Lent, E G (author). “Modeling Potential Liquefaction during an Earthquake under a Breakwater with PM4Sand.” 2020. Web. 02 Mar 2021.
Vancouver:
van Lent EG(. Modeling Potential Liquefaction during an Earthquake under a Breakwater with PM4Sand. [Internet] [Masters thesis]. Delft University of Technology; 2020. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:147aded2-e17e-4d24-ab7b-661bd1d8818c.
Council of Science Editors:
van Lent EG(. Modeling Potential Liquefaction during an Earthquake under a Breakwater with PM4Sand. [Masters Thesis]. Delft University of Technology; 2020. Available from: http://resolver.tudelft.nl/uuid:147aded2-e17e-4d24-ab7b-661bd1d8818c
University of Plymouth
22.
Crawford, Adam Randolph.
Measurement and analysis of wave loading on a full scale coastal structure.
Degree: PhD, 1999, University of Plymouth
URL: http://hdl.handle.net/10026.1/837
► The aim of this investigation was to measure and analyse wave loading on a full scale coastal structure in order to validate current breakwater design…
(more)
▼ The aim of this investigation was to measure and analyse wave loading on a full scale coastal structure in order to validate current breakwater design methods and to improve understanding of the physical processes involved. A range of new, robust field measurement instrumentation was developed and deployed at the chosen field site, the Alderney Breakwater in the Channel Islands. The instrumentation deployed in this particularly harsh wave loading environment included an array of wave loading pressure sensors together with co-located void fraction gauges, which were used to measure the percentage air entrained within the seawater. Wave data was measured by means of a sea bed array of six pressure sensors which were logged using an underwater data logger. Data from the instrumentation mounted on the breakwater wall was logged with a high specification remote data logger. Both the instrumentation and the data acquisition equipment were developed and adapted specifically for this investigation and as a result over 150 high quality data sets were recorded at very high logging rates, which allowed field data analysis at an unprecedented level. New calibration and data processing methods were developed for the analysis of this novel set of data records. Due to the meticulous planning, instrument development, data acquisition development, and deployment the data collected is, to the best of the Author's knowledge, the highest quality wave loading field data collected to date. The wave conditions measured at the site were used as inputs to three commonly used design methods for vertical coastal structures, which were used to estimate the maximum wave loading pressures over the height of the structure. The pressures and forces predicted by the models were contrasted with measured values and it was found that the Goda method (1985) predicted the events with a high degree of accuracy provided that the waves were not breaking directly onto the structure. When waves did break onto the structure high magnitude, short duration pressures were frequently measured which sometimes also acted over a very small spatial area. There was a large degree of temporal and spatial variability in the high magnitude breaking wave pressures and they were not accurately predicted by any of the models. The relationship between wave momentum flux and wave loading impulse was investigated both on a record by record basis and using a wave by wave analysis. For the Alderney field site a consistent relationship was found between the wave momentum flux and wave loading impulse, which could be used to estimate the wave loading impulse and duration for known wave input conditions. Features of interest were also identified from temporal comparisons of individual co-located pressure and aeration traces, including negative pressures and a negative correlation between air content and pressure over short time scales.
Subjects/Keywords: 624; Breakwater design
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APA (6th Edition):
Crawford, A. R. (1999). Measurement and analysis of wave loading on a full scale coastal structure. (Doctoral Dissertation). University of Plymouth. Retrieved from http://hdl.handle.net/10026.1/837
Chicago Manual of Style (16th Edition):
Crawford, Adam Randolph. “Measurement and analysis of wave loading on a full scale coastal structure.” 1999. Doctoral Dissertation, University of Plymouth. Accessed March 02, 2021.
http://hdl.handle.net/10026.1/837.
MLA Handbook (7th Edition):
Crawford, Adam Randolph. “Measurement and analysis of wave loading on a full scale coastal structure.” 1999. Web. 02 Mar 2021.
Vancouver:
Crawford AR. Measurement and analysis of wave loading on a full scale coastal structure. [Internet] [Doctoral dissertation]. University of Plymouth; 1999. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/10026.1/837.
Council of Science Editors:
Crawford AR. Measurement and analysis of wave loading on a full scale coastal structure. [Doctoral Dissertation]. University of Plymouth; 1999. Available from: http://hdl.handle.net/10026.1/837
Delft University of Technology
23.
Eijkelkamp, H. (author); Hendriks, C. (author); De Jong, C. (author); Otten, G.J. (author).
Erosion problem at Piçarras Beach: The cause of the erosion and possible counter measures.
Degree: 2017, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:eebf8eab-fba1-4fb2-a901-c2a1c000227a
► Over the last three decades the beach area of Piçarras has undergone large changes. The river Piçarras was fixed which caused severe erosion problems. With…
(more)
▼ Over the last three decades the beach area of Piçarras has undergone large changes. The river Piçarras was fixed which caused severe erosion problems. With large nourishment projects the municipality tried to create a sustainable beach area. However, these nourishments did not form a long term solution, which means that, until the present day, the beach still suffers from a retreating coastline causing various hazardous circumstances from time to time. The objective of this report is to reveal the most suitable solution to the erosion problem that enables the development of a sustainable beach area. The most suitable solution should be technically feasible but also has to be economically and socially realizable. The report is intended to provide an insight in the current phenomena causing the erosion. It provides an elaboration on economical, social and technical aspects to take into account when composing a plan to resolve the erosion problem. And it proposes various feasible solutions that could help in obtaining a sustainable beach area, these are tested against these aspects to define the most suitable one. Feasible measures that were given more detailed investigation, were placement of a breakwater to elongate the headland, placing a submerged breakwater, doing an alternative nourishment and creating a long- or short-term maintenance plan. Technically, the elongation of the headland with a breakwater appeared to be the most effective measure. However, in combination with other criteria that were taken into account like finances, politics and logistics, the submerged breakwater turned out to be most suitable. Eventually, this report gives an advice to the municipality of Piçarras about what measure(s) to take to protect the beach area at Piçarras.
Civil Engineering and Geosciences
Hydraulic Engineering
Advisors/Committee Members: Verhagen, H.J. (mentor), Miedema, S.A. (mentor), Bosch-Rekveldt, M.G.C. (mentor).
Subjects/Keywords: breakwater; multidisciplinary project; erosion; Piçarras; Brazil
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APA (6th Edition):
Eijkelkamp, H. (author); Hendriks, C. (author); De Jong, C. (author); Otten, G. J. (. (2017). Erosion problem at Piçarras Beach: The cause of the erosion and possible counter measures. (Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:eebf8eab-fba1-4fb2-a901-c2a1c000227a
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Eijkelkamp, H. (author); Hendriks, C. (author); De Jong, C. (author); Otten, G J (author). “Erosion problem at Piçarras Beach: The cause of the erosion and possible counter measures.” 2017. Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:eebf8eab-fba1-4fb2-a901-c2a1c000227a.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Eijkelkamp, H. (author); Hendriks, C. (author); De Jong, C. (author); Otten, G J (author). “Erosion problem at Piçarras Beach: The cause of the erosion and possible counter measures.” 2017. Web. 02 Mar 2021.
Vancouver:
Eijkelkamp, H. (author); Hendriks, C. (author); De Jong, C. (author); Otten GJ(. Erosion problem at Piçarras Beach: The cause of the erosion and possible counter measures. [Internet] [Thesis]. Delft University of Technology; 2017. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:eebf8eab-fba1-4fb2-a901-c2a1c000227a.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Eijkelkamp, H. (author); Hendriks, C. (author); De Jong, C. (author); Otten GJ(. Erosion problem at Piçarras Beach: The cause of the erosion and possible counter measures. [Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:eebf8eab-fba1-4fb2-a901-c2a1c000227a
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Delft University of Technology
24.
Scaminee, P.P. (author).
Tripoli breakwater reconstruction - evaluation and modification 1982 NEDECO design.
Degree: 1998, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:bb378ae3-d34c-4c94-9928-9efacec3ef5e
► This study comprises the design of the reconstruction of the main breakwater of the Tripoli Harbour in Libya. Tripoli harbour is one of the oldest…
(more)
▼ This study comprises the design of the reconstruction of the main breakwater of the Tripoli Harbour in Libya. Tripoli harbour is one of the oldest harbours of North Africa situated on the Southern coast of Mediterranean Sea. The harbour as it existed in 1972 was built at the beginning of this century and was protected by two main breakwaters. The original construction of these main breakwaters dates back to the Spaniards. The main breakwater on the North, known as the Spanish Mole, extended some 1900 m East North-East. A special feature of the harbour was the existence of a line of reefs north of the main breakwater about 100 m on the sea side, working as natural protection from wave attack. In the sixties, the increasing oil-based economic resources of Libya necessitated an expansion of the port facilities. Sir Bruce White, Wolfe Barry & Partners submitted a design of the breakwater locating the new breakwater some 100 m seaward from the Spanish Mole. The main breakwater was designed to be constructed in two stages; stage 1B, 2190 m long with a backfill (built 1972-1976, see Figure 2) and stage 2A, 2520 m long without any backfill (built 1974-1980). Significant wave heights of 4 and 4.5 m were adopted for the design of stages 1B and 2A respectively which were based on certain wave data available up to 1971 and 1975. Already during construction it became evident that the breakwater would not fulfil its design criteria. Two major storms in 1981 with a significant wave height of 9.2 m destroyed large parts of the breakwater. In deep-water sections (over 7m deep) almost all wave walls were broken and a large part of the 19-ton tetrapods damaged in the actual situation (see Figure 4). The direct hinterland of the breakwater is left at the mercy of overtopping water and spray. The two main roads on the landfill were completely eroded by overtopping and venting water.Netherlands Engineering Consultants (NEDECO) made a complete redesign of the breakwater in 1982 after the breakwater failure (see Figure 3).Meanwhile, during the last 16 years, extreme storms have further deteriorated the breakwater. Frequent nuisance of overtopping water and spray is no exception.The Harbour Authorities have asked for a complete evaluation and modification of the 1982 NEDECO design, because some criteria and boundary conditions have been changed significantly. In this study the new redesign criteria have been determined and based on these criteria a proposal for reconstruction has been worked out. The complete study of the Tripoli Breakwater reconstruction has been divided into four parts. These are: 1. Preliminary Investigations and Data Collection 2. Update Environmental Conditions 3. Preliminary Design 4. Optimization of the Reconstruction Design The approach used in the different sections is further described below and presented in a diagram.
Hydraulic Engineering
Civil Engineering and Geosciences
Advisors/Committee Members: Ligteringen, H. (mentor), Tutuarima, W. (mentor), Booij, N. (mentor), Stive, R. (mentor), D' Angremond, K. (mentor).
Subjects/Keywords: breakwater; damage; reconstruction
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APA (6th Edition):
Scaminee, P. P. (. (1998). Tripoli breakwater reconstruction - evaluation and modification 1982 NEDECO design. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:bb378ae3-d34c-4c94-9928-9efacec3ef5e
Chicago Manual of Style (16th Edition):
Scaminee, P P (author). “Tripoli breakwater reconstruction - evaluation and modification 1982 NEDECO design.” 1998. Masters Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:bb378ae3-d34c-4c94-9928-9efacec3ef5e.
MLA Handbook (7th Edition):
Scaminee, P P (author). “Tripoli breakwater reconstruction - evaluation and modification 1982 NEDECO design.” 1998. Web. 02 Mar 2021.
Vancouver:
Scaminee PP(. Tripoli breakwater reconstruction - evaluation and modification 1982 NEDECO design. [Internet] [Masters thesis]. Delft University of Technology; 1998. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:bb378ae3-d34c-4c94-9928-9efacec3ef5e.
Council of Science Editors:
Scaminee PP(. Tripoli breakwater reconstruction - evaluation and modification 1982 NEDECO design. [Masters Thesis]. Delft University of Technology; 1998. Available from: http://resolver.tudelft.nl/uuid:bb378ae3-d34c-4c94-9928-9efacec3ef5e
Delft University of Technology
25.
Mingou, P. (author).
Wave kinematics inside homogeneous submerged rubble-mound breakwater.
Degree: 2011, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:bb6fc1ba-3abf-4bbe-8605-bd4fb4ed1884
► Breakwaters are important for the preservation and development of coastal areas. Submerged breakwaters have significant advantages compared to emerged, such as economical construction and preservation,…
(more)
▼ Breakwaters are important for the preservation and development of coastal areas. Submerged breakwaters have significant advantages compared to emerged, such as economical construction and preservation, milder effect on landscape and under conditions, preservation of marine flora and fauna inside it. The main objective of this study is to give estimation about whether a homogeneous rubble-mound submerged breakwater could attract and preserve marine life inside it. This would be determined by measuring the water flow and thus oxygen adequacy inside such a structure. This research has been performed by means of a physical model. Three variables are considered in this study: wave period wave height submergence factor For different variations of the parameters, pressure gradients and pore velocities inside the breakwater are being measured. In the analysis of the data collected from the measurements, the impact of the varying variables is investigated leading to useful conclusions and better understanding of the entire process. Finally, suggestions of further research on this topic are discussed.
Hydraulic Engineering
Civil Engineering and Geosciences
Advisors/Committee Members: Memos, C. (mentor), Verhagen, H.J. (mentor), Papanikolaou, P. (mentor), Tsoukala, V. (mentor).
Subjects/Keywords: rubble mound; breakwater; pore velocity; pressure gradient
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APA ·
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APA (6th Edition):
Mingou, P. (. (2011). Wave kinematics inside homogeneous submerged rubble-mound breakwater. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:bb6fc1ba-3abf-4bbe-8605-bd4fb4ed1884
Chicago Manual of Style (16th Edition):
Mingou, P (author). “Wave kinematics inside homogeneous submerged rubble-mound breakwater.” 2011. Masters Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:bb6fc1ba-3abf-4bbe-8605-bd4fb4ed1884.
MLA Handbook (7th Edition):
Mingou, P (author). “Wave kinematics inside homogeneous submerged rubble-mound breakwater.” 2011. Web. 02 Mar 2021.
Vancouver:
Mingou P(. Wave kinematics inside homogeneous submerged rubble-mound breakwater. [Internet] [Masters thesis]. Delft University of Technology; 2011. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:bb6fc1ba-3abf-4bbe-8605-bd4fb4ed1884.
Council of Science Editors:
Mingou P(. Wave kinematics inside homogeneous submerged rubble-mound breakwater. [Masters Thesis]. Delft University of Technology; 2011. Available from: http://resolver.tudelft.nl/uuid:bb6fc1ba-3abf-4bbe-8605-bd4fb4ed1884
Delft University of Technology
26.
Lioutas, A.C. (author).
Experimental research on spatial distribution of overtopping.
Degree: 2010, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:0122fe2e-0260-489f-b258-6e167fa9a621
► The overtopping empirical formulas calculate the discharge only at the top of the crest of a coastal protection structure. On the other hand, the tolerable…
(more)
▼ The overtopping empirical formulas calculate the discharge only at the top of the crest of a coastal protection structure. On the other hand, the tolerable overtopping discharges are defined at certain points behind the crest where the total overtopping is reduced. The scope of this thesis is to find an empirical formula to describe the distribution of overtopping at the space behind the crest. This thesis comes as a further investigation on the work conducted by v.Kester [2009] for regular waves. In this research, a physical model was developed on which irregular waves are tested. Because of the duration of the tests and the amount of collected water (significant lose of water during the test), a completely new measuring system was designed. Five influencing parameters (variables) are considered on this research: wave height, wave period/steepness, slope angle, crest freeboard and crest permeability. The entire overtopping process is analysed separately for the total overtopping discharge, the overtopping discharge directly behind the crest and the distribution of overtopping behind the structure. In the analysis of the data collected from the measurements, the impact of the varying parameters is investigated leading to useful conclusions and better understanding of the entire process. Additionally, the experimental findings are analysed and compared to the relative existing methods. Based on the TAW [2002] method which is proposed by the EurOtop Manual [2007], a prediction formula is developed. This formula is a generic version of TAW [2002] formula in which a new reduction factor ?c is introduced in order to describe the decay of the overtopping and thus predict the discharge at any certain distance behind the crest. Other relevant methods are also analysed (Juul Jensen [1984], Steenaard [2002], Besley [1999] and v.Kester [2009]) and conclusions for their applicability are drawn leading to suggested improvements or corrections. Apart from the distribution of overtopping, on this thesis the determination of crest freeboard (which is an ambiguous issue) is also investigated. Finally, suggestions of further research on this topic are discussed. The entire work has been perfomed in close cooperation with van Oord.
Hydraulic Engineering
Civil Engineering and Geosciences
Advisors/Committee Members: Stive, M.J.F. (mentor), Verhagen, H.J. (mentor), Uijttewaal, W.S.J. (mentor), Smith, G. (mentor).
Subjects/Keywords: breakwater; physical modelling
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APA ·
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Export
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APA (6th Edition):
Lioutas, A. C. (. (2010). Experimental research on spatial distribution of overtopping. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:0122fe2e-0260-489f-b258-6e167fa9a621
Chicago Manual of Style (16th Edition):
Lioutas, A C (author). “Experimental research on spatial distribution of overtopping.” 2010. Masters Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:0122fe2e-0260-489f-b258-6e167fa9a621.
MLA Handbook (7th Edition):
Lioutas, A C (author). “Experimental research on spatial distribution of overtopping.” 2010. Web. 02 Mar 2021.
Vancouver:
Lioutas AC(. Experimental research on spatial distribution of overtopping. [Internet] [Masters thesis]. Delft University of Technology; 2010. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:0122fe2e-0260-489f-b258-6e167fa9a621.
Council of Science Editors:
Lioutas AC(. Experimental research on spatial distribution of overtopping. [Masters Thesis]. Delft University of Technology; 2010. Available from: http://resolver.tudelft.nl/uuid:0122fe2e-0260-489f-b258-6e167fa9a621
Delft University of Technology
27.
Everts, P.S. (author).
Probabilistic Design of a Rubble Mound Breakwater.
Degree: 2016, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:1358b70c-ed09-48c7-b9d2-35b519c9ec4c
► All over the world rubble mound breakwaters are built to protect harbours, shorelines, and other vulnerable coastal areas against wave action and currents. Most of…
(more)
▼ All over the world rubble mound breakwaters are built to protect harbours, shorelines, and other vulnerable coastal areas against wave action and currents. Most of the designs for these structures use so called deterministic or semi-probabilistic design methods (level I). With these methods insight in the uncertainties, and consequently the actual failure probability and behaviour of the structure, is lacking. Moreover, less is known about the physical and mathematical relation between the variables and design formulas. The uncertainties in the variables and design formulae in a semi-probabilistic method are taken into account by partial safety factors. This could lead to an overly conservative design. By applying a probabilistic calculation (level II and III) insight is obtained in the relations between variables, the failure behaviour and the probability of failure of the structure. This information can explain why certain structures, which are designed with a semi-probabilistic method, fail even though the design conditions are not reached or in most cases survive above the design conditions. Information on the actual failure behaviour and probability is desired to make a more reliability design and economic optimization. Despite these benefits probabilistic design methods offer, it is not often applied in daily engineering practice. Multiple studies show the feasibility of designing a rubble mound breakwaters with a probabilistic design method in theory. However in practice only few rubble mound breakwaters are designed with a probabilistic design method. This research investigates how a probabilistic design of a rubble mound
breakwater can be made in practice and provides some guidelines when a probabilistic design can be considered. The project Taman is used as a case and from this project a rubble mound
breakwater is selected for the fully probabilistic calculation. Simplifications are made regarding the applied mathematical models1 and only four failure mechanisms related to the Ultimate Limit State (ULS) are examined. The four main failure mechanisms are: seaside and rear-side armour stability, toe stability and macro stability. With these simplifications a clear and thoroughly insight is gained in the probabilistic design process of a rubble mound
breakwater without loosing track of the actual objective of this study. The fully probabilistic calculation is made with a level III probabilistic design method by applying a Monte Carlo simulation. The results show that this method is a good way to take into account the occurring statistical and physical correlation. Furthermore the Monte Carlo analysis gives a good insight in the most dominant failure mechanisms and in the governing failure situations for each mechanism. The results of the fully probabilistic calculation show that making a semi-probabilistic design based on the design rules in The Rock Manual [2007] results in a conservative design (Pf ,sys,tL = 0.5%). One optimization step is made for the simplified case in this research by applying lower stone…
Advisors/Committee Members: Jonkman, S.N. (mentor), Verhagen, H.J. (mentor), Kuiper, C. (mentor), Bouw, R. (mentor).
Subjects/Keywords: probabilistic design; correlation; rubble mound breakwater
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APA (6th Edition):
Everts, P. S. (. (2016). Probabilistic Design of a Rubble Mound Breakwater. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:1358b70c-ed09-48c7-b9d2-35b519c9ec4c
Chicago Manual of Style (16th Edition):
Everts, P S (author). “Probabilistic Design of a Rubble Mound Breakwater.” 2016. Masters Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:1358b70c-ed09-48c7-b9d2-35b519c9ec4c.
MLA Handbook (7th Edition):
Everts, P S (author). “Probabilistic Design of a Rubble Mound Breakwater.” 2016. Web. 02 Mar 2021.
Vancouver:
Everts PS(. Probabilistic Design of a Rubble Mound Breakwater. [Internet] [Masters thesis]. Delft University of Technology; 2016. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:1358b70c-ed09-48c7-b9d2-35b519c9ec4c.
Council of Science Editors:
Everts PS(. Probabilistic Design of a Rubble Mound Breakwater. [Masters Thesis]. Delft University of Technology; 2016. Available from: http://resolver.tudelft.nl/uuid:1358b70c-ed09-48c7-b9d2-35b519c9ec4c
Delft University of Technology
28.
Soerdjoesing, G.D. (author).
Theoretisch experimenteel onderzoek naar de weerstand van een oscillerende stroming in een porezue massa.
Degree: 1968, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:e0cd1062-a4eb-4e43-8e3a-c2634454fab4
Jaartal geschat. Resultaten van metingen naar golfdoordringing in een poreuze breakwater.
Hydraulic Engineering
Civil Engineering and Geosciences
Subjects/Keywords: poreuze breakwater; golfdoordringing
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APA (6th Edition):
Soerdjoesing, G. D. (. (1968). Theoretisch experimenteel onderzoek naar de weerstand van een oscillerende stroming in een porezue massa. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:e0cd1062-a4eb-4e43-8e3a-c2634454fab4
Chicago Manual of Style (16th Edition):
Soerdjoesing, G D (author). “Theoretisch experimenteel onderzoek naar de weerstand van een oscillerende stroming in een porezue massa.” 1968. Masters Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:e0cd1062-a4eb-4e43-8e3a-c2634454fab4.
MLA Handbook (7th Edition):
Soerdjoesing, G D (author). “Theoretisch experimenteel onderzoek naar de weerstand van een oscillerende stroming in een porezue massa.” 1968. Web. 02 Mar 2021.
Vancouver:
Soerdjoesing GD(. Theoretisch experimenteel onderzoek naar de weerstand van een oscillerende stroming in een porezue massa. [Internet] [Masters thesis]. Delft University of Technology; 1968. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:e0cd1062-a4eb-4e43-8e3a-c2634454fab4.
Council of Science Editors:
Soerdjoesing GD(. Theoretisch experimenteel onderzoek naar de weerstand van een oscillerende stroming in een porezue massa. [Masters Thesis]. Delft University of Technology; 1968. Available from: http://resolver.tudelft.nl/uuid:e0cd1062-a4eb-4e43-8e3a-c2634454fab4
Delft University of Technology
29.
Vlasblom, H.J. (author).
Een onderzoek naar een oscillerende stroming in een poreuze massa.
Degree: 1968, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:23977b42-4385-421b-8163-d1fa103121d0
Uitwerking van de waarnemingen van Le Méhouté over het gedrag van golven in een doorlatende golfbreker.
Hydraulic Engineering
Civil Engineering and Geosciences
Subjects/Keywords: poreuze breakwater; golfdoordringing
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MLA ·
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APA (6th Edition):
Vlasblom, H. J. (. (1968). Een onderzoek naar een oscillerende stroming in een poreuze massa. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:23977b42-4385-421b-8163-d1fa103121d0
Chicago Manual of Style (16th Edition):
Vlasblom, H J (author). “Een onderzoek naar een oscillerende stroming in een poreuze massa.” 1968. Masters Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:23977b42-4385-421b-8163-d1fa103121d0.
MLA Handbook (7th Edition):
Vlasblom, H J (author). “Een onderzoek naar een oscillerende stroming in een poreuze massa.” 1968. Web. 02 Mar 2021.
Vancouver:
Vlasblom HJ(. Een onderzoek naar een oscillerende stroming in een poreuze massa. [Internet] [Masters thesis]. Delft University of Technology; 1968. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:23977b42-4385-421b-8163-d1fa103121d0.
Council of Science Editors:
Vlasblom HJ(. Een onderzoek naar een oscillerende stroming in een poreuze massa. [Masters Thesis]. Delft University of Technology; 1968. Available from: http://resolver.tudelft.nl/uuid:23977b42-4385-421b-8163-d1fa103121d0
Delft University of Technology
30.
Arefin, Syed Shamsil (author).
Rocking Revisited 2: Measurement on Rocking of cubes in a Double Layer on a Breakwater.
Degree: 2017, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:d0fa9dae-2bbd-4896-b1ea-2623cbe32909
► Rocking behavior of breakwater research was conducted by Centre for Civil Engineering Research and Codes workgroup CUR C70 (1989) and after that no further validation…
(more)
▼ Rocking behavior of
breakwater research was conducted by Centre for Civil Engineering Research and Codes workgroup CUR C70 (1989) and after that no further validation of the research work has been done. In order to understand the rocking behavior and validate the previously conducted research CUR C70 (1989) wave flume test has been conducted in similar setup. One of the important parameter of rocking behavior is the magnitude of impact velocity and the distribution of this impact velocity stochastically and spatially. This research investigates the order of the magnitude of the impact velocity and distribution of the impact velocity comparing, validating and concluding new findings those were not incorporated in CUR C70 (1989) research. During this research a new type of sensor Tinyduino has been used inside a cube to measure the acceleration and angular velocity of the cubes. Eight of these sensors were used in eight different cubes. All the sensors were tested properly in Deltares to check the sensors working properly and better understanding the sensors. Before this research two test programs were performed by Deltares in tetrapod in double layer using this Tinyduino sensor in stand alone mode but the data were not analyzed. This research analyzed the data for the tetrapods provided by Deltares and compared with CUR 70 (1989). During this analysis and the testing of the sensors it is found that angular velocity measurement can be much more reliable than acceleration hence the angular velocity measurement is used during data processing of instrumented cubes in double layer. For experiments eight instrumented cubes were placed using very flexible wire in a randomly placed double layer cubes with same size and almost similar density over a permeable filter layer. The slope 1:1.5 is used for the experiment same as the CUR C70 (1989) research conducted. The cubes were placed in one constant level but the water level is varied in order to demonstrate different slope position. Three slope position Y/Dn=0, Y/ Dn =-2 and Y/ Dn =-4 is used during the research program. Three different wave heights and two wave steepness were used during this test program. Due to time limitation 18 test setups within two days were performed. The data were collected real-time using wire and saved in text file simultaneously with eight instrumented cubes stored in a laptop provided by Deltares. After the test program all the data is processed with matlab script and analyzed. The result of the analysis showed that the order of the magnitude of impact velocities is same as the CUR C70 (1989) research. It has also been found that the impact velocities are also dependent on the wave steepness which was not included in the CUR C70 (1989) research. So it is recommended for future work to update the equation incorporating wave steepness. Another important parameter is number of collision which was assumed to be 3 times is CUR C70 (1989) but found incorrect during this thesis. It is concluded that number of collision is…
Advisors/Committee Members: Uijttewaal, Wim (graduation committee), Hofland, Bas (mentor), van den Bos, Jeroen (graduation committee), Gent, M.R.A. (graduation committee), van der Lem, J.C. (graduation committee), Delft University of Technology (degree granting institution), Norwegian University of Science and Technology (degree granting institution), University of Southampton (degree granting institution).
Subjects/Keywords: CoMEM; Coastal Engineering; Breakwater; Armor Unit; Rocking
Record Details
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Arefin, S. S. (. (2017). Rocking Revisited 2: Measurement on Rocking of cubes in a Double Layer on a Breakwater. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:d0fa9dae-2bbd-4896-b1ea-2623cbe32909
Chicago Manual of Style (16th Edition):
Arefin, Syed Shamsil (author). “Rocking Revisited 2: Measurement on Rocking of cubes in a Double Layer on a Breakwater.” 2017. Masters Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:d0fa9dae-2bbd-4896-b1ea-2623cbe32909.
MLA Handbook (7th Edition):
Arefin, Syed Shamsil (author). “Rocking Revisited 2: Measurement on Rocking of cubes in a Double Layer on a Breakwater.” 2017. Web. 02 Mar 2021.
Vancouver:
Arefin SS(. Rocking Revisited 2: Measurement on Rocking of cubes in a Double Layer on a Breakwater. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:d0fa9dae-2bbd-4896-b1ea-2623cbe32909.
Council of Science Editors:
Arefin SS(. Rocking Revisited 2: Measurement on Rocking of cubes in a Double Layer on a Breakwater. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:d0fa9dae-2bbd-4896-b1ea-2623cbe32909
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Open Access Theses and Dissertations